[Speex-dev] Question from XM Radio

Dario Andrade
Mon, 28 Nov 2005 10:20:54 -0000

Hi,

> You can try the Ogg DirectShow filter to get Windows support for Speex:
> http://www.illiminable.com/ogg/

if you wait a little longer, I am trying to provide speex support for the
ffmpeg project (www.ffmpeg.org).
It does encode/decode to/from avi and wav, a support for ogg has not been
done, and my question is, should it be necessary? I don't really like ogg in
first place..

> > - Has there been any successful satellite streaming projects using
> > Speex?
>
> Not that I know of.
>

Actually IP.TV (http://www.ip.tv) is using speex. It is a video/audio
streaming software for elearning and collaboration.
Right now we have clients using VSATs and/or pure broadcast through
IP encapsulation at the hub (ViaSAT, Hughes, Gilat, and Nera).

> > - Has there been any projects having a decoder embedded in an IC
>
> Not that I know of.
>
> > - If none of the above, what type of processing power for real-time
> > Encoding/Decoding are we talking.  Does anyone have real-time
> > encoding/decoding software yet?
>
> The source code can be compiled as fixed-point and I would think the
> complexity is somewhere in the 5-10 MIPS range for encode+decode
> (decoding is cheaper than encoding).
>
> 	Jean-Marc
>
>
>
>
> ------------------------------
>
> Message: 3
> Date: Sun, 27 Nov 2005 17:11:00 -0500
> From: "Carr, Terrance" <Terry.Carr@xmradio.com>
> Subject: RE: [Speex-dev] Question from XM Radio
> To: "Jean-Marc Valin" <Jean-Marc.Valin@USherbrooke.ca>
> Cc: speex-dev@xiph.org
> Message-ID:
> 	<E63FE688D5966F4A9E78770555DE90AE08012E@ITWEXC01-DC.xmradio.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Thanks for the reply.  We are currently using AMBE (4Kbps) for our
> Traffic/Weather Channels.  If you have ever had a chance to hear the
> service, you will know that AMBE does not do us well.
>
> I understand that 2Kbps is low quality, but any poorer than AMBE?
>
> If can get a decent quality for other low bandwidth talk channels, such as
> about 10-16Kbps and have it sound rather clean, then I would be gaining a
> bit of growth in the areas I'm seeking.
>
> None of this would be Music, understand.  Music needs it's bandwidth...
> just voice only channels like:
>
> - Emergency Announcements
> - Barkers (This channel is not yet scheduled for Air
> - Traffic/Weather
> - ...etc
>
> Thanks again for the reply.
>
> __________________________________________________________________________
> __________________
> Terry Carr
> Manager, Broadcast Applications
> XM SATELLITE RADIO
> 1500 Eckington Place, NE (Flr-2, Ops Mgt)
> Washington, DC 20002
> Phone: (202) 380-4081 - Fax: (202) 380-4768
>
> ________________________________
>
> From: Jean-Marc Valin [mailto:Jean-Marc.Valin@USherbrooke.ca]
> Sent: Sun 11/27/2005 4:55 PM
> To: Carr, Terrance
> Cc: speex-dev@xiph.org
> Subject: Re: [Speex-dev] Question from XM Radio
>
>
>
> You can try the Ogg DirectShow filter to get Windows support for Speex:
> http://www.illiminable.com/ogg/
>
> > My goal is to find a promising codec for 2Kbps.
>
> You should be aware that the 2 kbps mode has quite poor quality in
> Speex, a bit similar to the LPC10 vocoder.
>
> > - Has there been any successful satellite streaming projects using
> > Speex?
>
> Not that I know of.
>
> > - Has there been any projects having a decoder embedded in an IC
>
> Not that I know of.
>
> > - If none of the above, what type of processing power for real-time
> > Encoding/Decoding are we talking.  Does anyone have real-time
> > encoding/decoding software yet?
>
> The source code can be compiled as fixed-point and I would think the
> complexity is somewhere in the 5-10 MIPS range for encode+decode
> (decoding is cheaper than encoding).
>
>         Jean-Marc
>
>
>
>
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> ------------------------------
>
> Message: 4
> Date: Sun, 27 Nov 2005 14:23:57 -0800
> From: Ralph Giles <giles@xiph.org>
> Subject: Re: [Speex-dev] Question from XM Radio
> To: "Carr, Terrance" <Terry.Carr@xmradio.com>
> Cc: speex-dev@xiph.org
> Message-ID: <20051127222357.GA12973@ghostscript.com>
> Content-Type: text/plain; charset=us-ascii
>
> On Sun, Nov 27, 2005 at 03:20:07AM -0500, Carr, Terrance wrote:
>
> > I have installed the DBpowerAMP converter and have some files
converted,
> but I cannot play the SPX files in Windows Media Player.
>
> You should be able to play .spx files in Windows Media Player after
> installing the directshow filters from http://www.illiminable.com/ogg/
>
> Hope that helps,
>  -r
>
>
> ------------------------------
>
> Message: 5
> Date: Mon, 28 Nov 2005 10:54:36 +1100
> From: Jean-Marc Valin <jean-marc.valin@usherbrooke.ca>
> Subject: RE: [Speex-dev] Question from XM Radio
> To: "Carr, Terrance" <Terry.Carr@xmradio.com>
> Cc: speex-dev@xiph.org
> Message-ID: <1133135676.21297.2.camel@theorix.CeNTIE.NET.au>
> Content-Type: text/plain
>
> On Sun, 2005-11-27 at 17:11 -0500, Carr, Terrance wrote:
> > Thanks for the reply.  We are currently using AMBE (4Kbps) for our
> > Traffic/Weather Channels.  If you have ever had a chance to hear the
> > service, you will know that AMBE does not do us well.
> >
> > I understand that 2Kbps is low quality, but any poorer than AMBE?
>
> If AMBE is 4 kbps, then most likely yes.
>
> > If can get a decent quality for other low bandwidth talk channels,
> > such as about 10-16Kbps and have it sound rather clean, then I would
> > be gaining a bit of growth in the areas I'm seeking.
>
> 10-16 kbps is different and Speex is probably more useful there.
>
> 	Jean-Marc
>
>
> ------------------------------
>
> Message: 6
> Date: Mon, 28 Nov 2005 06:49:20 -0500
> From: v.r@vif.com
> Subject: [Speex-dev] Google Talk
> To: speex-dev@xiph.org
> Message-ID: <20051128064920.yf6iua4e848w8wkk@email.vif.com>
> Content-Type: text/plain;	charset=ISO-8859-1
>
> Supports:
>
> http://www.google.com/talk/developer.html#codecs
>
> :)
>
>
> ------------------------------
>
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> Speex-dev@xiph.org
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>
>
> End of Speex-dev Digest, Vol 18, Issue 27
> *****************************************